Smith, 22, and Unlu, 20, pleaded guilty in the Supreme Court on Tuesday to one charge of assisting an offender and one charge of perjury.

Chief Crown prosecutor Gavin Silbert, SC, told the court the shooting was another tragic case involving the use of the drug ice, which had become a problem sweeping the city.

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Mr Silbert said Mr Torun and Ms Doyle had been in a relationship since November last year but the couple had been having problems and Ms Doyle was trying to end it.

Mr Silbert said Mr Torun shot Ms Doyle with a sawn-off 12-gauge shotgun on April 17 in front of Smith and Unlu.

"Both Smith and Unlu colluded in the hiding of the murder weapon, which was removed from the premises at Military Road," the prosecutor said.

"It was wrapped in a piece of clothing and placed in the back of a black Holden Astra driven to the premises by Smith.

"Unlu also removed a bag containing Torun's drug trafficking kit and a bumbag containing Torun's personal drug use kit and subsequently put them in the black Holden Astra."

Mr Silbert said Smith and Unlu then drove to the nearby Caltex service station where they spoke to police and denied any knowledge of the shooting.

Defence barrister Philip Dunn, QC, for Smith, said the young woman had been confronted with a truly shocking and terrifying event - seeing Ms Doyle shot in front of her - when she agreed to try to cover up the crime.

Mr Dunn told Justice Lex Lasry he was unlikely to read about what happened next.

Smith and Unlu drove to the service station with the gun and the drugs before Smith told a complete stranger someone had been shot.

The stranger, in a "Quentin Tarantino way", then offered to take the gun and the drugs and Smith gave them to him, Mr Dunn said.

Smith later confided in a police officer as to what had actually happened.

Mr Dunn said that since the shooting, Smith had confronted her drug problem and entered a rehabilitation clinic.

Smith, who has agreed to be a prosecution witness against Mr Torun, who has been charged with murder, changed her mobile phone number a few days after the shooting but received a call on October 15 in which she was told, "We're coming to get you."

Smith's aunt, Caroline, told the court the memory of Ms Doyle being shot would stay with her niece for the rest of her life.

Defence barrister Carolene Gwynn, for Unlu, said he told police the Avondale Heights flat he shared with Mr Torun was like "a black cave where you can find your way in but can't find your way out again".

Unlu claimed Torun had used a Taser on him more than once, even when he was sleeping, but he stayed because Mr Torun was supplying him with drugs.

Ms Gwynn said Unlu had tried to help Mr Torun after the shooting because he felt he had to do what he was told.

Ms Doyle's mother, Jenny, in a victim impact statement, said her life had been changed forever since her daughter's death and she felt so much grief, heartache and despair.

She remembered waking up on Mother's Day a few weeks after the shooting and tears were streaming down her face because she knew Kara would not be coming to visit her. She had to visit Kara instead at the cemetery.